<fieldset class="activeForm" id="upload">
    <div>
        <label for="file-input">
            <?php echo sprintf($this->_('File (max. %1$sB)'), preg_replace('/([kMG])/', ' $1', min(array(ini_get('upload_max_filesize'), ini_get('post_max_size'))))) ?>
        </label>
        <input type="file" id="file-input" name="archive_file" />
    </div>
</fieldset>